adding Complex Support

[bauom]

Describe the feature

the pyccel-cuda library does not support complex numbers.
as the C complex type are not supported.

Example:

import cupy as cp
x = cp.array([1+2j, 3-4j, 5+6j], dtype=complex64)

[EmilyBourne]

@bauom please could you improve this issue. Your "describe the feature" section describes the problem but does not mention what you think should be done about it . I think it could also be useful to link to the discussion here : #12 (comment)